Gear housing



Dec. 17, 1929. BLOOD 1,739,779

GEAR HOUS ING Filed Dec. 16, 192s 2 Sheets-Sheet 1 Dec. 17, 1929. H. E. BLOOD I 1,739,779

GEAR HOUSING Filed Dec. 16 1926 2 Sheets-Sheet 2 9 10 7/5 Z 5 2 2? f 4 6 Z 4 20 ,za 5

Patented Dec. 17, 1929 HOWARD BLOOD, OF DETROIT, MICHIGAN, ASSIGNOR T DETROIT GEAR & MACHINE COMPANY, A .COR?ORATION OF MICHIGAN GEAR HOUSING .dpp1ieat1on'fi1ed December 16, 1926. Serial No. 155,147.

provide a housing for reduction gears having internal passages therein extendinginto close proximity to the gears for thecirculation of a cooling fluid to prevent the gears and the lubricating medium with which the housing is adapted to be filled from overheating. e Other and further important objects of this invention will be apparent from the dis:

closures in the specification and the accompanying drawings.

29 On the drawings:

Figure 1 is an elevational end view of a device embodying the principles of my invention. Figure 2 is an elevational view of the other as end of the device.

Figure 3 is a sectional view taken on lines III-J11 of Figure 1, with parts in elevation.

Figure 4 is a sectional view taken on line IV-IV of Figure 3.

30 Figure 5 is a sectional view taken on line VV of Figure 3.

lhe reference numeral 1 indicates generally a housing for reduction gears, more especially of the type adapted for use with marine engines. Said housing 1 comprises an open ended body casting 2 provided with a substantially fiat base 3, vertical side walls 4 and 5, and a semi-cylindrical top wall 6 (Figure 4). Side extensions 7 and 8 are formed on said side walls 4 and 5, respectively, and are integrally joined with said top wall 6 by means of webs 9 and 10. Said extensions 7 and 8 are'drilled as at 11 and 12, respectively, to receive fastening bolts for securing the housing to a supporting structure. On one end wall 17 of said casting 2 there are provided in the lower corners thereof intefira bosses 13 and 14, said bosses and the we.

being drilled and tapped to receive pipes for conducting a cooling fluid into the interior of thecasting. Assuming the passage 15 in the boss 13 to be the inlet, the cooling fluid passes therethrough into a lateral chamber 16 (Figure 4) of general triangular shape and extending substantially the length of the casting 2 between the end walls 17 and 18. A similar passage 19 extends lengthwise of the casting 2 in communication with an outlet passage 20 through the boss 14. Said lateral chambers 16 and 19 communicate at one end by, means of passages 21 and 22 (Figure 5) formed in the end wall 17 of the casting 2, said passages 21 and 22 being divided by a rib 23, shown in dotted lines in Figure 1. An inwardly projecting extension 24, formed integrally with the inner wall 25 of the end 17, provides a chamber 26 communicating with the passages 21 and 22. Said chamber 26 is bounded by upper and lower arcuate shaped walls 27 and 28 respectively (Figure 4) and a rear wall 29. Said rear wall 29 forms a part of a disk-shaped portion 30 (Figure 3) which is provided with a circular recess 31 in .its rear face for receiving a bearing race 32.

A second circular recess 33, in the front face of said disk 30 and vertically oifset from said recess 31, is adapted to receive a bearing race Said bearing race 32, comprising inner and outer concentric spaced rings 35 and 36 between which are mounted ball bearings 37 is adapted to rotatably support one end of a gear shaft 38. Similarly the bearing race 34, which comprises inner and outer spaced concentric rings 39 and 40 with ball bearings 41 ,therebetween, is adapted to support one end of a gear shaft 42. The gear shaft 38 carries a hub 43 (Figure 3) to the inner peripheral face of which is secured by means of rivets 44 a hollow internal gear 45. Said gear 45, which is cylindricalin shape, extends substantially to the-inner wall 25 of the end 17 (Figure 3),.and encloses the extension 24. 'Said gear 45 isprovided with gear teeth 46 extending for-a portion only of the length of said. gear 45. Said gear teeth 46 are adapted to mesh with the teeth 47 of a pinion gear 48 mounted upon the shaft 42 and lying within the hollow gear 45. The shaft 42 extends through the end 17 of the casting 2 and is journalled in an apertured head 49 closing said hub 68 and the concentric hub 65.

sa d end 17. Said head 49 (Figure 1) is provided with an annular flange '50 adapted to be secured by means of bolts 51 to said end 17 of the casting. As best shown in Figure 3, a bearing race 52 comprising inner and outer spaced concentric rings 53 and 54 and ball bearings 55 therebetween, is adapted to be mounted in said head 49 to serve as a bearing for the shaft 42. On the outer end of the gear shaft 42 there is splined a coupling head 56 having a hub 57 abutting the bearing race 52 and provided with an oil sealing ring 58 which is adapted to form an oil tight joint be tween the head 49 and the hub 57. Adriving shaft 59 is shown as coupled with the gear shaft 42 by means of bolts 60 extending through a coupling head 61 on said shaft 59 and the coupling head 56 on the shaft 42. The faces of said coupling heads 56 and 61 are provided with suitable packing 62 to make a flexible coupling.

The other end of the casting 2 is provided with a head 63 secured to said casting bymeans of bolts 64. The gear shaft 38 extends through an apertured hub 65 of said head 63 and is journalled in a bearing race 66 supported in said hub. On the free end of said shaft 38 there is mounted a coupling head 67 having a hub 68 splined to the shaft 38 in abutting relation with the bearing race 66. An oil sealing ring 69 is positioned betweeg driven shaft 70 having a coupling head 72 splined' thereto is adapted to be coupled to the shaft 38 by means of bolts 71 extending throu h the coupling heads 67 and 72.

As best shown in Fi ure 2, the head 63 is provided with an oil lling spout 73 opening into the interior of the hub 65 and fitted with a plug cap 74. Oil thus admitted through the spout 73 passes around the bearing race 66 and through the hub 65 into the casting 2. The oil naturally fills said housing 1 to the level of the spout 73 and is carried around by the ear 45 so as to thoroughly lubricate all of t e internal bearings and contacting gear surfaces. It should be noted that the action of the gear45 is to carry the oil up between the teeth of the gears 45 and 48, from whence theoil will flow down over the gear 48 onto the upper wall 27 of the cooling water chamber 26. At that point there will be a constant transfer of heat between the oil and the OOOliIlg water through the wall 27. A drain plug 75 (Figure 2) is P provided in the lower part of the head 63 for draining the oil. Similarly drains 76 and 77 are provided in the walls 18 for draining the water from the casting 2.

It will thusbe seen that the above described gear housing provides eflicient means for preventing the oil and gears from overheating. The arrangement of parts whereby cooling water may be circulated between the ing races.

gear faces effects very efiocient cooling of the surrounding a part of said passage.

2. In a reduction gear, a hollow internal gear, a second gear meshing therewith and a housing enclosing said gears and having a passage extending-within said hollow gear for the circulation of a cooling fluid.

3. A housing for gears, comprising an open ended body casting having internal passages therein for the circulation of a cooling fluid and heads for the ends of said body casting for confining a lubricating fluid within said body.

4. A housing for gears, comprising an open ended body casting having internal passages therein for the circulation of a cooling fluid and heads for the ends of said body casting for confining a lubricating fluid within said body, said heads being recessed and centrally apertured, bearing races in said recesses, other bearing races supported from said casting and gear carrying shafts extending through said apertured heads and journalled in said bear- 5. A'gear housing, comprising a passaged body casting and a pair of gears journalled in said body casting, one of said passages extending between said gears and within one of said gears to conduct a cooling fluid.

6. A housing for gears, comprising a body portion having apertured ends, apertured heads for said ends, bearings mounted in: said head apertures, an interiorly projecting hollow extension formed on said body portion and provided with recesses, bearings mounted in said recesses, gear shafts journalled in said bearings and means for 1ntroducing a coolingfiuid into said hollow extension. g

7. A housing for gears, comprising a body ortion having an integral inwardly pro- ]ecting hollow extension, said extension having recesses therein and bearings mounted in said recesses, there being passages in said body portion communicating with said hollow extension for the circulation of a cooling fluid to preventoverheating of said bearings.

8. A gear set, comprising a body casting having lateral inlet and outlet passages for a cooling fluid, an elevated chamber and passages in one end wall connectin said lateral assages with said chamber, said body castin being adapted to be partially filled with a lu ricating medium, and gears mounted within said casting adapted to carry the lubricating medium up onto the walls of said elevated chamber.

9. A gear set, comprising a hollow body casting having passages formed therein for the circulation of a cooling fluid and an elevated chamber in communication with said passages, said casting being adapted to be partially filled with a lubricating fluid, and gears supported from said casting adapted by their operation to carry the lubricating fluid into contact with the walls of said elevated chamber, whereby a cooling of said lubricating fluid may be efiected.

' 10. A housing for gears, comprising a body casting having integrally formed lateral and end passages communicatin with an intermediate elevated chamber, In ricatingfluid in the housing and overlying said passages, and

, said chamber, said vpassages being adapted for the circulation of a cooling fluid to cool said lubricating fluid.

11. A housing for gears, comprising a body casting, a hollow internal gear, a pinion gear within said internal gearand meshing therewith and a portion of said body casting extending within said hollow gear and forming bearing supports for said gears.

In testimony whereof I have hereunto subscribed my name.

- HOWARD E. BLOOD. 

